论文标题
介子衰变中的深色颗粒的成对产生
Pair production of dark particles in meson decays
论文作者
论文摘要
$ k $和$ b $ meson的罕见腐烂提供了对带有新粒子的黑暗行业的强大探测。我们表明，$ o（100 \，{\ rm mev}）$黑暗状态的对生产可以用$ k_l $ ersons的衰减进行探测，这是由于增强的两体运动学，$ k_l \ $ k_l \ to x_1x_2 $或$ x_2x_2 $。如果两个粒子不稳定，例如$ x_2 \ tox_1π^0 $，$ x_2 \ tox_1γ$或$ x_ {1,2} \toγγ$，这种衰减很容易模仿$ k_l \ toπ^0ν\overlineν$'我们构建了增强$ K_L $衰减标志的显式模型，并受Koto实验的结果限制。我们注意到，最近还可以在满足所有其他约束（$ b $衰减，colliders，beam dumps）的同时，还可以容纳多余的事件。这些模型基于该理论的规格和/或标量扇区的扩展。 $ x_ {1,2} $粒子的最轻的粒子（如果稳定）可能构成全部暗物质。
Rare decays of $K$ and $B$ mesons provide a powerful probe of dark sectors with light new particles. We show that the pair production of $O(100\,{\rm MeV})$ dark states can be probed with the decays of $K_L$ mesons, owing to the enhanced two-body kinematics, $K_L\to X_1X_2$ or $X_2X_2$. If either or these two particles is unstable, e.g. $X_2\to X_1π^0$, $X_2\to X_1γ$ or $X_{1,2}\to γγ$, such decays could easily mimic $K_L\to π^0 ν\overlineν$ signatures, while not being ruled out by the decays of charged kaons. We construct explicit models that have enhanced $K_L$ decay signatures, and are constrained by the results of the KOTO experiment. We note that recently reported excess events can also be accommodated while satisfying all other constraints ($B$ decays, colliders, beam dumps). These models are based on the extensions of the gauge and/or scalar sector of the theory. The lightest of $X_{1,2}$ particles, if stable, could constitute the entirety of dark matter.
